After my service is live, my site won’t be available for about 30 minutes. And when I check the console, there are some infinite HEAD requests popping in continuously, at first I thought it was a DDoS but it always happen after every build.
Hi there,
These HEAD requests are from our Port detector. If you have implemented your own request handler logging, you will see them for 15 minutes after each deployment, and then they will stop. HEAD requests are used to determine if the open port is an HTTP or TCP port.
Regards,
Keith
Render Support, UTC+10 
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